<template>
    <div class="xtx-city" ref="target">
        <div class="select" @click="toggleDialog" :class="{active}">
            <span v-if="!fullLocation" class="placeholder">请选择配送地址</span>
            <span v-else class="value">{{ fullLocation }}</span>
            <i class="iconfont icon-angle-down"></i>
        </div>
        <div class="option" v-if="active">
            <div v-if="loading" class="loading"></div>
            <template v-else>
                <span @click="changeItem(item)" class="ellipsis" v-for="item in currList" :key="item.code">{{ item.name }}</span>
            </template>
        </div>
    </div>
</template>

<script setup>
import { computed, ref, reactive } from 'vue'
import { onClickOutside } from "@vueuse/core"
import axios from "axios";
// 控制展开收起，默认收起
const active = ref(false)
const loading = ref(false)
const cityData = ref([])

const props = defineProps({
    fullLocation: {
        type: String,
        default: ''
    }
})

const emit = defineEmits(['change'])

const openDialog = () => {
    active.value = true
    loading.value = true
    // 获取数据
    getCityData().then(res => {
        cityData.value = res
        loading.value = false
    })
    // 清空选择结果
    for (const key in changeResult) {
        changeResult[key] = ''
    }
}

// 定义计算属性
const currList = computed(() => {
    // TODO 根据点击的省份城市获取对应的列表
    // 省份
    let currList = cityData.value
    // 城市
    if (changeResult.provinceCode) {
        currList = currList.find(p => p.code === changeResult.provinceCode).areaList
    }
    // 地区
    if (changeResult.cityCode) {
        currList = currList.find(c => c.code === changeResult.cityCode).areaList
    }
    return currList
})

const closeDialog = () => {
    active.value = false
}

// 切换展开收起
const toggleDialog = () => {
    if (active.value) closeDialog()
    else openDialog()
}

// 点击其他位置隐藏
const target = ref(null)
onClickOutside(target, () => {
    closeDialog()
})

// 获取城市数据
const getCityData = () => {
    // 这个位置可能有异常操作，封装成Promise
    return new Promise((resolve, reject) => {
        if (window.cityData) {
            // 有缓存
            resolve(window.cityData)
        } else {
            // 无缓存
            const url = 'https://yjy-oss-files.oss-cn-zhangjiakou.aliyuncs.com/tuxian/area.json'
            axios.get(url).then(res => {
                window.cityData = res.data
                resolve(window.cityData)
            })
        }
    })
}

const changeResult = reactive({
    provinceCode: '',
    provinceName: '',
    cityCode: '',
    cityName: '',
    countyCode: '',
    countyName: '',
    fullLocation: ''
})

// 选择地址
const changeItem = (item) => {
    // 省份
    if (item.level === 0) {
        changeResult.provinceCode = item.code
        changeResult.provinceName = item.name
    }

    // 市
    if (item.level === 1) {
        changeResult.cityCode = item.code
        changeResult.cityName = item.name
    }

    // 地区
    if (item.level === 2) {
        changeResult.countyCode = item.code
        changeResult.countyName = item.name
        changeResult.fullLocation = `${changeResult.provinceName} ${changeResult.cityName} ${changeResult.countyName}`
        // 关闭地址栏
        closeDialog()
        emit('change',changeResult)
    }
}
</script>

<style scoped lang="less">
.xtx-city {
  display: inline-block;
  position: relative;
  z-index: 400;
  .select {
    border: 1px solid #e4e4e4;
    height: 30px;
    padding: 0 5px;
    line-height: 28px;
    cursor: pointer;
    &.active {
      background: #fff;
    }
    .placeholder {
      color: #999;
    }
    .value {
      color: #666;
      font-size: 12px;
    }
    i {
      font-size: 12px;
      margin-left: 5px;
    }
  }
  .option {
    width: 542px;
    border: 1px solid #e4e4e4;
    position: absolute;
    left: 0;
    top: 29px;
    background: #fff;
    min-height: 30px;
    line-height: 30px;
    display: flex;
    flex-wrap: wrap;
    padding: 10px;
    > span {
      width: 130px;
      text-align: center;
      cursor: pointer;
      border-radius: 4px;
      padding: 0 3px;
      &:hover {
        background: #f5f5f5;
      }
    }
      .loading {
          height: 290px;
          width: 100%;
          background: url(../../assets/images/loading.gif) no-repeat center;
      }
  }
}
</style>
